How to Wash a Black Car without Scratching It The secret to washing a black car without scratching it is to avoid contaminating the cleaning tools. Even tiny pieces of grit or debris can cause noticeable scratches in the paint. Harsh commercial cleaning solutions can also damage the car's finish. Use gentle, organic products and avoid commercial car washes to keep your black car looking like new. Things you'll need 2 buckets Car-wash solution Hose with spray nozzle Tar remover 2 sheep-skin mitts Synthetic chamois Micro-fiber cloth Instructions 1. Add one-quarter to one-half cup of car-wash solution to one of the buckets, then fill it with warm water. Fill the other bucket with plain water. 2. Rinse the car and wheels using a light fan spray. The goal is to loosen the dirt, not grind it in. Remove any tar stains with a commercial tar remover. 3. Dip one sheep-skin mitt into the soapy solution. Wash a small area of the car, but don't rub too hard. If you pick up pieces of dirt or sand w ... Read more »